Acquisition of Two-Dimensional Flowlite Laser Doppler Anemometer

摘要：库珀科学与艺术促进联盟的这一奖项是为了表彰为阿尔伯特·内尔肯工程学院流体实验室购买的二维Flowlite激光多普勒风速仪(LDA)。土木工程系首席研究员Joseph Cataldo教授将在热羽、喷流动力学和颤振实验中使用这些设备，这些实验是目前正在进行或计划进行的与该研究计划相关的研究领域。LDA的多功能性将为教职员工和学生提供在工程学院流体力学研究的基础上再接再厉的机会，该学院已经进行了30多年的流体力学研究。该学院流体实验室的实验内容包括：1)电厂热羽流的静态和动态效应；2)热锋；3)湖水卷吸到排放羽流中的模式和量化；4)污水混合溢流中的分层流动；5)监测含水层中的石油污染；6)表面波和射流的相互作用；7)轴对称湍流射流中卷吸的流动显示和径向速度测量；8)射流上的雷诺数研究；9)混沌；10)射流中的低雷诺数；在颤振实验中，激光将被用来开辟复杂的二维和三维行为研究的新领域，通过振动平板及其周围的振动平板。射流实验中的雷诺应力可以在低雷诺数、表面波与射流的相互作用和卷吸流动情况下确定。此外，利用所提出的Flowlite系统还可以确定热锋的移动。目前正在使用热线探头。目前LDA的尺寸、重量和一维流动限制使其无法获得全面的二维和三维流动测量。拟议的Flowlite LDA可以测量速度流的X、Y、Z位置并跟踪锋面的运动。当前系统的障碍之一是，我们的研究生几乎在上课时间连续使用它，使得我们几乎不可能安排它用于向本科生演示流体现象。收购拟议的Flowlite LDA系统意味着我们的本科生也将在他们的学期实验项目中获得LDA。此外，购买该仪器使我们能够在必修的本科课程中有一台激光用于演示和实验。最重要的是，新的LDA将加强土木工程和机械工程之间的持续合作(例如，前述颤振实验是在流体实验室旁边的机械工程实验室的风洞中进行的)，使我们的机械工程专业的学生能够与我们的土木工程专业的学生进行联合项目。Flowlite LDA改进的机动性和轻量化使其几乎成为一种便携式系统，而且几乎无需维护。

Abstract:This award to The Cooper Union for the Advancement of Science and Art is for the purchase of a Two-Dimensional Flowlite Laser Doppler Anemometer (LDA) for the Fluids Laboratory of the Albert Nerken School of Engineering. The Principal Investigator Joseph Cataldo, Professor of Civil Engineering, will use the equipment in connection with experiments in thermal plume, jet dynamics, and flutter, areas of research that are presently being conducted or are planned in connection with this research program.The versatility of the LDA will provide faculty and students with the opportunity to build on the engineering school's research in hydrodynamics, which it has been conducting for over three decades. The school's Fluids Laboratory has been the setting for experiments on such topics as: 1) static and dynamic effects of power plant thermal plumes; 2) thermal fronts; 3) patternization and quantification of the lake water entrainment into a discharge plume; 4) stratified flow in combined sewage overflow; 5) monitoring petroleum contamination in an aquifer; 6) interaction of surface waves and a jet; 7) flow visualization and radial velocity measurements of entrainment in an axisymmetric turbulent jet; 8) the study of Reynolds number on a jet; 9) chaos; 10) low Reynolds number in a jet; and, 11) hydrodynamic flutter.The laser will be used to open up new areas of research into complex two- and three-dimensional behavior through and around oscillating plates in the flutter experiment. The Reynolds stress in the jet experiments can be determined for low Reynolds numbers, surface wave interaction with the jet and entrainment flows. Also the movement of the thermal fronts can be determined with the proposed Flowlite system. The hot wire probe is presently being used. The size, weight and one dimensional flow limitation of the present LDA makes it impossible to obtain comprehensive two- and three- dimensional flow measurements. The proposed Flowlite LDA can measure X, Y, Z positions of the velocity flows and trace the movement of the fronts.One of the impediments of the current system is that it is used almost continuously during school hours by our graduate students, making it nearly impossible to schedule its use for demonstrations of fluid phenomenon to our undergraduate students. The acquisition of the proposed Flowlite LDA system means that our undergraduate students will also have an LDA for their term laboratory projects. Moreover, acquisition of the instrument enables us to have available a laser for demonstration and experiments in required undergraduate courses. Most important, the new LDA will enhance ongoing collaborations between civil and mechanical engineering (e.g., the aforementioned flutter experiment was conducted in the wind tunnel in the Mechanical Engineering Laboratory adjacent to the Fluids Laboratory), making it possible for our mechanical engineering students to conduct joint projects with our civil engineering students. The improved mobility and lightweight of the Flowlite LDA make it virtually a portable system; and it is virtually maintenance free.